Heterosis is _______
A. the combination of lethal alleles due to inbreeding
B. an increased vigor of hybrids resulting from the crossing of inbred strains
C. a measurement of the variance due to environmental factors
D. the result of homozygosity of multiple, dominant, detrimental alleles.
B
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Which of the following are soluble mediators and activators for T lymphocytes and B cells?
A) IL-2 B) IL-4 C) IL-5 D) IL-2, IL-4, and IL-5
Which cytoskeletal structures represent a highly diverse group of tension-bearing fibers important to the maintenance of cell shape?
A. microtubules B. intermediate filaments C. microfilaments D. centrioles E. pili
Which of the following could be an agent of natural selection?
A. accidental death of cows by lightning strikes B. insects that are eaten after they have reproduced C. characteristics of female animals that cause males to avoid them D. increases in the population size
There is a fear that preconception genetic testing may lead to "designer babies." What historical practice comes to mind regarding the production of such babies?
A) gene driving B) gene editing C) inbreeding D) eugenics